35mpg+ at 80mph from a fast petrol?
Discussion
tyranical said:
Just wondered if there is anything out there for anywhere from 8-15k that is a fast (200bhpish <7 seconds), smallish petrol car that can still do 35mpg if cruising at 80mph and generally over a normal driving life so bits of town, motorway, hooning, etc.
Yes............apparently!
james_gt3rs said:
CraigyMc said:
This is exactly what BMW say in the 320d EfficientDynamics handbook:
Does that technique work better in diesels then?There are folk on here who do fuel maps and the like for a living, they'd probably know best.
ETA: The BMW owners handbook is for all 3-series cars, not just diseasel ones...
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Possibly the same engine or the previous version from the Mk5 GTI, mine has the newer engine that's in the Mk6. Mine is also DSG but that shouldn't make much difference when cruising. I averaged 40mpg recently going from Buxton to Harpenden. The average was ~30mpg as I hit the motorway (the last 2 3rds of the distance) so I must have been getting ~45 on the motorway stretch. The long 50mph sections will have helped though.
mackie1 said:
Possibly the same engine or the previous version from the Mk5 GTI, mine has the newer engine that's in the Mk6. Mine is also DSG but that shouldn't make much difference when cruising. I averaged 40mpg recently going from Buxton to Harpenden. The average was ~30mpg as I hit the motorway (the last 2 3rds of the distance) so I must have been getting ~45 on the motorway stretch. The long 50mph sections will have helped though.
Both the gearbox ratios and final drive are different in the DSG cars (at least, they were 6 months ago when I was last looking for a new car).I think the actual overall ratios aren't all that different, but the drag characterisics probably will be.
There are a couple of VW-group 2.0 TFSI turbo engines, which irritatingly have both been in the same cars (eg. Mk.2 TT has seen both).
They are also 1984cc each, sharing exactly the same cylinder dimensions (82.5 by 92.8).
The older one is coded by VW group as EA113. approx 2005-2008.
The newer one is coded by VW group as EA888. apppox 2008+ but lots of carrs still have the older engine.
They are a bugger to tell apart from marketing materials, since the latter engine in some specifications is meant to replace the former - so VW have tuned it to exactly the same ratings are the older engine in some cases. In the case of Audi-tuned cars, the later engine has variable lift so has much higher torque measurements than the former.
C
JonRB said:
geeteeaye said:
This thread will bring out the people that have no idea what mpg their car does, but have once seen a high figure and quote it...
Can't speak for other people, but I have 14 years of data for my car on a spreadsheet. Pretty much every tank of fuel I put in it. I could bore you with a PDF of if it you want.
(Sorry to quote Clarkson but it felt appropiate(sp?))On another note however. Feel free to send the pdf my way would be interesting to have a look at. you should have a wide range of fuel prices in there as well.
tyranical said:
Not sure how true that is.
I've got an ibiza with the same engine, at 80mph its doing about 27mpg max.
I'd hazard a guess as to saying something isn't running 100% right on that car. In every 1.8t car i've ever driven (Octavia VRS, Golf GTI and the Leon Cupra R) the minimum MPG at 80 is around 33-35. I think the VRS would achieve closer to 40.I've got an ibiza with the same engine, at 80mph its doing about 27mpg max.
They seem to mix the TSI and TFSI designations too. Audis with the non-valvelift version (e.g. the A3) still use the TFSI badge when the Golf and Octavia etc call it TSI. No idea when the changeover happened in the Eos but it coincided with the facelift in the Octavia although some pre-FL cars have the newer engine I gather.
solidlad84 said:
I'd hazard a guess as to saying something isn't running 100% right on that car. In every 1.8t car i've ever driven (Octavia VRS, Golf GTI and the Leon Cupra R) the minimum MPG at 80 is around 33-35. I think the VRS would achieve closer to 40.
Nothing obvious if thats the case as its been serviced regularly (only done 2000 miles ago) and it runs sweet as a nut.mackie1 said:
They seem to mix the TSI and TFSI designations too. Audis with the non-valvelift version (e.g. the A3) still use the TFSI badge when the Golf and Octavia etc call it TSI. No idea when the changeover happened in the Eos but it coincided with the facelift in the Octavia although some pre-FL cars have the newer engine I gather.
Good info. I was unaware of that!I think both the old and new VW-group engines are pretty decent for a turbo petrol of that power.
My old TT did 58mpg (when really trying), with a combined average of 33mpg over 78K miles. I don't hang about much.
At 80mph for a few hours I'd say it would do probably about 35mpg. The lowest it ever got was just over 10mpg, doing silly speeds on the autobahn.
I had a 2006 TT, which at the time was the lightest car VW group put that engine in (at 1260kg), so I think it was probably the most economical of the EA113-generation cars.
I'd imagine a 2008+ fwd TT with the EA888 engine would be better, it'd be nice to know the difference.
I got rid of that car last week. New steed: 320d EfficientDynamics. Best I've had so far is 86mpg, worst 51, average 65 - but it's only got 600 miles on the clock so far!
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buzzer said:
andyroo said:
My 182 would only do 29mpg at 80mph according to the trip computer
so did mine until I changed the Lambda sensor... improved MPG no end.In fact, on a lot of early cars with a lambda sensor that have done a load of miles, it may pay to change it. My BMW 728i improved by 2 MPG overall after i changed it.
PKLD said:
geeteeaye said:
This thread will bring out the people that have no idea what mpg their car does, but have once seen a high figure and quote it...
too late.
Hmmmm it's not hard though is it? Fill up, set trip meter, fill up, work out how many litres/gallons you used for the miles you've just travelled?too late.
On motorway, cruising at 80mph. Notice there isn't much traffic around and decide to see what mpg car is achieving *resets trip* - ooh look, 40 mpg, isn't my car economical *catches up traffic, turns trip off and makes mental note to tell people how little fuel car uses*
geeteeaye said:
That isn't what most people are doing though, more like this.
On motorway, cruising at 80mph. Notice there isn't much traffic around and decide to see what mpg car is achieving *resets trip* - ooh look, 40 mpg, isn't my car economical *catches up traffic, turns trip off and makes mental note to tell people how little fuel car uses*
Well my car tells me what mpg it is doing, instant, for the journey and since last reset. So as long as it is accurate I know it does 35mpg at a steady 80, 33mpg average on my journey to work and 32mpg average since I got it. On motorway, cruising at 80mph. Notice there isn't much traffic around and decide to see what mpg car is achieving *resets trip* - ooh look, 40 mpg, isn't my car economical *catches up traffic, turns trip off and makes mental note to tell people how little fuel car uses*
It'll also do 0-60 in about 7 seconds. It's not small or petrol though, 4.4litre TDV8 Range Rover.
geeteeaye said:
That isn't what most people are doing though, more like this.
On motorway, cruising at 80mph. Notice there isn't much traffic around and decide to see what mpg car is achieving *resets trip* - ooh look, 40 mpg, isn't my car economical *catches up traffic, turns trip off and makes mental note to tell people how little fuel car uses*
That's a pretty sweeping statement. Do you have anything to base that on?On motorway, cruising at 80mph. Notice there isn't much traffic around and decide to see what mpg car is achieving *resets trip* - ooh look, 40 mpg, isn't my car economical *catches up traffic, turns trip off and makes mental note to tell people how little fuel car uses*
My commute doesn't involve motorways anymore but my 184PS MINI Cooper S has averaged over 42 mpg for the last 1000 miles. My old commute was a mix of town and motorway driving (with cruise set to 85) and never saw below 36 mpg.
- Quoted figures were taken from trip computer. I'm sure a calibrated flow meter and calculator combination would show genuine figures of 5 mpg.
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